Vol. 4 & Issue 4 ; Section A : Chemical Sciences

Date : Aug. to Oct.2014

 

Investigation on the Inhibition of Mild Steel Corrosion in neutral solution by 1-(8-hydroxy quinolin-2yl-methyl) thiourea

S. S. Syed Abuthahir, A.Jamal Abdul Nasser, S. Rajendran, N.Vijaya and P.Shanthy

  • Abstract

    1-(8-hydroxy quinolin-2yl-methyl) thiourea (HTF) has been used as a corrosion inhibitor in controlling corrosion of mild steel immersed in an aqueous solution containing 60 ppm of Cl-. Weight loss study shows that 250 ppm of HTF provide 64% of inhibition efficiency. AC impedance spectra reveal that a protective film is formed on the mild steel surface. The protective film has been analyzed using Fourier Transform Infrared spectra. The surface morphology has been analyzed by Scanning Electron Microscope (SEM) and EDAXs. 

Kinetics and Mechanism of Phase Transfer Catalyst Aided Free Radical Polymerization of Acrylonitrile Initiated by PeroxydiphosphateTetraethylammonium Chloride Under bi phase Condition

G.Thangaraj, A.Ramu, R.Sayee Kannan

  • Abstract

    The kinetics of phase transfer catalyzed free radical polymerization of acrylonitrile (AN) using potassium peroxydiphosphate (PDP) as an initiator and tetraethylammonium chloride (TEAC) as a phase transfer catalyst were studied. The polymerization reactions were carried out in ethyl acetate – water bi phase media at 50 (±) 0.10C in an inert atmosphere under unstirred condition. The effect of experimental conditions such as concentrations of monomer, initiator, phase transfer catalyst (PTC) and acid strength,temperature were studied. The order with respect to the concentration of monomer, phase transfer catalyst and the initiator were found to be 1.0, 1.0 and 0.5 respectively. The rate of polymerization (Rp) is independent of acid strength, ionic strength. However, an increase in the polarity of solvent slightly increases the Rp value. Based on the experimental results, a suitable kinetic mechanism has been proposed.

Preparation of core-shell structured Fe3O4 /chitosan nanocomposite and its adsorption performance of Pb(Ⅱ)

Maosheng Fu 

  • Abstract

     Magnetite (Fe3O4) nanoparticles were firstly synthesized by a facile one-pot solvothermal synthesis in the presence of ethylene glycol (EG), FeCl3•6H2O and NaHCO3, which followed to surface modification by γ-amino propyl-triethoxysilane(KH550). Finally core-shell structured Fe3O4 /chitosan (Fe3O4@CS) nanocomposite was synthesized by Schiff base reaction between KH-550-silanized Fe3O4 nanoparticles and chitosan using glyoxal as a coupling agent, which was characterized using XRD, FT-IR and TEM, and its adsorption performance of Pb(Ⅱ) ions was investigated. It was found that Fe3O4 nanoparticles were chemically bonded to chitosan molecular and encircled by chitosan to lead to the formation of the core-shell structure. The adsorption data of Fe3O4@CS nanocomposite for Pb(Ⅱ) ions obeyed the Langmuir equation. The maximum uptake of Pb(II) ions at pH = 5 and 298k are 41.53 mg/g. 

Synthesis and Characterization of Polyaniline-Cobalt Hydroxide Nanocomposite

M. R. Patle, Anand more1, Bhagat G. K.

  • Abstract

    “Nanocomposite” is a special class of materials originating from suitable combinations of two or more such nanoparticles or nano sized objects in some suitable technique, resulting in materials having unique physical properties and wide application potential in diverse areas that can be formed into a useful object which can be subsequently used.Cobalt hydroxide-Polyaniline Nanocomposite have great potential technological applications in various fields like catalysis, lubricants, electronics, etc. X-ray diffraction is an easy and one of the most important characterization tools used in nanomaterial research field. In current study, an important nanocomposite-Cobalt hydroxide-Polyaniline nanocomposite has been successfully prepared by chemical oxidation process and its structural characterization has been studied by important tool like X-ray diffraction technique, Infrared spectroscopy, etc. The results confirmed nanocomposite formation of uniform size less than 30nm.Based on the observations of a strong absorption seen in the 1600-1000 cm-1 region as well as at 3215 cm-1 arise from both intercalated and adsorbed species. Urea hydrolysis result in the formation of free NH3 which under pressure, can be expected to intercalated within the hydroxyl layers, leading to the ready formation of α-type phases. The peaks at position in the range of 4000–400 cm-1, at 3400–3500 (OH…HOH) and at 3000–3100cm-1at 650–900 Nanocomposite which are of great potential in nanomaterial applications.cm-1 confirms brucite-likesheet structure for the given sample.We report here a simple chemical route by using chemical oxidation method for the synthesis of Cobalt hydroxide-Polyaniline

Synthesis and Characterization of Poly(N-Phenylanthranilic acid)/ Fe0 Nanocomposite

D.K.D. Janani, R. Anbarasan

  • Abstract

    Chemical polymerization of N-phenylanthranilic acid was carried out in the presence of ferric chloride under nitrogen atmosphere at 0-5ºC for 24hours. The added ferric chloride is acting as an initiator as well as the nanomaterial. As a result we are getting poly (N-phenylanthranilic acid)/Fe0 (PNPAA/Fe0) nanocomposite system. Thus obtained polymer nanocomposite was characterized by FTIR spectroscopy, UV-visible spectroscopy, fluorescence spectroscopy, FESEM and conductivity measurements like analytical methods.

A New Flavone and Glycosides of T. Purpurea

 Abhimanyu Yadav, Vibha Singh, Pratiksha Singh and Jagdish P. Singh

  • Abstract

    A new flavone and a glycoside have been isolated from rhizomes of Tephrosia purpurea and their structures were established by chemical along with spectroscopic data. The new flavone was named as candidine and glycoside was as 3, 5 - dimethoxycinnamylalcohol -4-0 (b-D- glucopyranoside)

     

Electrochemical and Thermodynamic Studies on the Anticorrosive Performance of Musa acuminata extract on mild steel in acid medium

N. Gunavathy and S.C. Murugavel

  • Abstract

    The corrosion inhibition performance of Musa acuminata green fruit peel [MA-P] extract on mild steel in 1N phosphoric acid was assessed in the temperature range of 303 K-353 K. The weight loss results revealed that the inhibition efficiency of MA-P extract enhanced with the increase in concentration but decreases with rise in temperature. Inhibitor showed a maximum efficiency of 78.89 % at 2 % v/v extract concentration at 323 K. The polarization curves indicate that MA-P acts as a mixed type of inhibitor. Electrochemical impedance plots shows change in charge transfer capacitance with the change in concentration of the peel extract. The adsorption characteristics of the inhibitor was approximated by Temkin adsorption isotherm and tested for its fit to the experimental data. The activation energy Ea was higher for the inhibited acid than for the uninhibited acids showing the temperature dependence of the inhibitor efficiency. The negative value of ΔGads and ΔHads indicated the physisorption nature of adsorption by the inhibitor. SEM study on the surface morphology of mild steel showed that inhibited metal surface is smoother than the uninhibited surface indicating that protective film formed by the inhibitor on the metal surface reduces the corrosion.

Synthesis and Antimicrobial Study of 3-(Substitutedphenyl)- 1-(2, 5-Dimethoxy-4-Methyl Phenyl) Prop-2-en-1-One

V.G.Patel and Tulsigiri. K.Goswami

  • Abstract

    The chalcones (1, 3-diaryl-2-propenones) and their derivatives are important intermediates in organic synthesis and widespread applications in medicinal industry. The title chalcone derivative, 3-(substitutedphenyl)-1-(2, 5-dimethoxy-4-methyl phenyl) prop- 2-en-1-one has been synthesized. The synthesis derivative characterized by FTIR, 1H NMR, 13C NMR and LC Mass spectroscopy. Synthesized compounds have been screened for their antimicrobial activity against different panel of organisms 

Synthesis, Spectral Characterization and Biological Evaluation of Some Novel Pyrazolines

V.G.Patel and Tulsigiri.K.Goswami

  • Abstract

    Title compounds 2-pyrazoline have been prepared by reaction of 1-(4- methyl-2, 5-dimethoxyphenyl)-3-(substituted-phenyl)prop-2-en-1-one(1a-k)which on treatment with 4-methylbenzohydrazide hydrochlorideto give1-(3-(4-methyl-2,5- dimethoxyphenyl)-5-(substitutedphenyl)-(4,5-dihydropyrazo-l-1-yl)-(4-methylphenyl )methadone (2a-k).The structural assignment of the compounds was based on elements analysis and IR, 1H NMR and Mass spectral data. All the synthesized compounds have been screened for their antimicrobial activity to gram-positive and gram-negative bacterial strains and antifungal activity. The antimicrobial activities of the synthesized compounds have been compared with standard drugs like Amoxycillin, Ciprofloxecine and Griseofulvin. Purity of synthesized compounds has been checked by TLC.

Synthesis Spectral Charactrization and Biological activity of Cobalt (II) Complexes with three Macrocyclic Ligands

Sulekh Chandra Poonam Pipil, Swati Agarwal

  • Abstract

    Complexes of Co (II) with macrocyclic ligand (BDPY (ADPY) and (DDPY) have been synthesized. All these complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility measurement, electronic and EPR spectral studies. On the basis of elemental analysis the complexes were found to have composition [CoLX2]. Where L = BDPY, ADPY and DDPY and X = SO42-Cl-, NCS-, NO3Molar conductance measured in DMF solution indicates that complexes are non-electrolyte in nature, except complexes, [Co(BDPY) SO4] and [Co(DDPY) SO4]. Thus the complexes may be formulated as [CoLX2] and [CoL(SO4)] respectively. Complexes have six coordinated distorted octahedral geometry. The ligand field parameters were calculated using various energy level diagrams. In vitro synthesized compounds and metal salts have also been tested against some species of plant pathogenic fungi and bacteria in order to assess their antimicrobial properties.

Volumetric and viscometric study of aqueous ethylene glycol in butan-2-ol and propan-2-ol

Sk. Md Nayeem, M. Kondaiah, K. Sreekanth and D. Krishna Rao

  • Abstract

    Densities, ρ, and viscosities, η of 10 m and 5 m aqueous ethylene glycol solution in propan-2-ol and butan-2-ol have been measured over the entire composition range at 308.15 K. From this experimental data, excess molar volume, E m V , excess Gibbs free energy of  tivation of viscous flow, ΔG*E and deviation in viscosity, Δη have been determined. Negative values of E m V , positive values of ΔG*E and Δη are observed over the entire composition range in the mixtures studied. The partial molar volumes and excess partial molar volumes of the components at infinite dilution,  V m,1 ,  V m,2 , , 1 , EmV , ,  ,2 Em V have been also calculated. The observed negative and positive values of excess and deviations attributed to the existence of strong interactions such as geometrical fitting of smaller molecules into the voids created by larger molecules in the liquid mixtures. The data for all the investigated solutions have been compared with the theoretically estimated values using empirical relations such as, Grunberg and Nissan, Hind et al and Katti and Chaudhari.

Ultrasonic Studies on Molecular Interaction of Maltose in Aqueous NaCl Solution

Suneel Kumar Singh and Subhash Chaudhary

  • Abstract

    Density and Ultrasonic velocity of Maltosein 1M aqueous NaCl solution at 298.15K, 303.15K, 308.15K and 313.15K were recorded. Various ultrasonic and solution parameters such as adiabatic compressibility, molar volume, molar ultrasonic velocity, Wada’s constant, molar hydration number and relative association have been calculated using the experimental data. The trend in variation of these properties has been utilized to identify and discuss the possible molecular interactions present in the system under investigation.

Kinetics of Phenol Uptake from Wastewater by Adsorption in a Fixed Bed

S. J. Kulkarni and J. P. Kaware

  • Abstract

    Removal of phenol by using adsorption is very widely studied area of research. The present research aims at studying the kinetics of phenol removal in fixed bed by using low cost adsorbent obtained from ground nut shells. The data obtained in the experiments was verified for first and second order kinetics. The general kinetic equations were used. The effects of initial concentration, bed height and flow rate on the kinetics of solute uptake were studied. These parameters were found to affect the solute uptake kinetics. The effect in some cases though was not significant. As expected with initial concentration and flow rate, the time for adsorption reduces and it increases with bed height. The optimum pH value was observed to be 6 for the solute uptake.

Morphology, Structural Characterization and Investigation of Moisture Absorbing Ability of the Synthesized para-Toluene Sulfonic Acid-doped Polyaniline

Anelyn P. Bendoy, Mylene M. Uy, Reynaldo M. Vequizo

  • Abstract

    A greenish black emeraldine salt form of polyaniline was successfully synthesized through oxidative chemical polymerization. Structural characterization of the samples via FT-Infrared spectroscopy (FT-IR) revealed a broad absorption peak at ~1115 cm-1 which is assigned C-H in-plane bending supports that it is in an emeraldine salt form. Successful doping with para-Toluene Sulfonic Acid was confirmed by an absorption peak at ~1034 cm-1 characteristic of SO3- group which could be a site for water molecule accommodation. This is supported by the hollow centred rod-like structure formation observed in the surface morphology of the sample using Scanning Electron Microscopy (SEM). After exposure of the sample to moisture, new peak at ~3239 cm-1 indicative of intermolecular hydrogen bonding O-H stretch was observed and increased in weights of the sample were observed.

pH- Metric Study Studies of Transition Metal Complexes With Substituted Imidazolinone Drug In Mixed Solvent System at a Constant Ionic Strength.

R. R. Tayade, Alice. S. Chandami, M.P. Wadekar

  • Abstract

    The interaction between Ni(II), Cu(II) and Zn(II) metal ions and substituted imidazolinone have been studied at 0.1 M Ionic Strength in 70 % DMFwater mixture by Bjerrum method as adopted by Calvin and Wilson. It is observed that Ni(II), Cu(II) and Zn(II) metal ions form 1:1 complex with ligands (L1& L2). The data obtained were used to estimate and compare the values of proton-ligand stability constant (pK) and metal-ligand stability constants (logk). From estimated data (pK and log k), the effects of substituents were studied. Ligand used for present work were (L1) 1-[2-hydroxy-5-(3 Chloro phenyl azo) benzylidene amino]-2-phenyl-4-benzylidene-5-oxoimidazoline (L2)1-[2-hydroxy-5-(4-bromo phenyl azo) benzylidene amino]-2-phenyl-4-benzylidene- 5-oxoimidazoline. 

Tryptophan as Copper Corrosion Inhibitor in 1M Nitric Acid Solution

K. Barouni, A. Kassale, L. Bazzi and A. Albourine

  • Abstract

    Corrosion inhibition of copper in nitric acid by tryptophan (Try) was studied using gravimetric, electrochemical polarization, and scanning electronmicroscopy (SEM) measurements. The effect of inhibitor concentration, temperature and immersion time against inhibitor action was investigated. Results show that this inhibitor act as good inhibitors for the corrosion of copper in HNO3 solution. Increasing inhibitor concentration increases the inhibition efficiency. Temperature studies revealed an increase in inhibition efficiency with rise in temperature and corrosion activation energies decreased in the presence of Try. It was found that adsorption of used Try on copper surface follows Langmuir isotherm and has a chemisorptions mechanism. The SEM micrographs revealed that the corroded surface area is decreased in the presence of Try. Some Quantum Chemical parameters were calculated by the AM1 and MNDO Semi-empirical method to provide further insight into the mechanism of inhibition of the corrosion process. 

Synergism in Solvent Extraction and Solvent Extraction Kinetics

Roshni Sarkar (Sain), Sumon Ray and Sukalyan Basu

  • Abstract

    Extraction methods of different metal ions viz, Au(III), Fe(III), Co(II), Cr(III), Ni(II) and U(VI) by synergistic extraction technique using different extractants in different extracting conditions has been reviewed. Among the parameters controlling synergism, the effect of diluents is highlighted and it has been explained with the help of Hildebrand’s Regular Solution Theory Kinetics of these synergistic extractions will enrich us about mechanistic step ladder of this ingrained separation technique which will be supportive to our scientific society in future progress in the field of extraction techniques.

Corrosion Control of Carbon Steel by Eco–Friendly Inhibitor L–Cysteine–Zn2+ System in Aqueous Medium

A. Sahaya Raja, J. Sathiyabama, R. Venkatesan, V. Prathipa

  • Abstract

    The environmental friendly inhibitor system L- Cysteine -Zn2+ has been investigated by weight loss method. A synergistic effect exists between L- Cysteine and Zn2+ system. The formulation consisting of 250 ppm of L- Cysteine and 5 ppm of Zn2+ offers good inhibition efficiency of 97%. Polarization study reveals that this formulation functions as an anodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. The surface morphology has been analyzed by FT-IR, UV-visible, SEM and EDAX. A suitable mechanism of corrosion inhibition is proposed based on the results obtained from weight loss study and electrochemical studies. 

Light harvesting efficiency calculations on Coumadin based dyes design in the application of dye sensitized solar cells (DSSC)

N. Nadeem Afroze, K. Subramani, P. Muzammil, A. MD. Sabeelullah Roomy

  • Abstract

    Quantum dynamics transient electronic excitations of three dyes are studied, which are proposed for electronic excitations by HOMO-LUMO energy gaps. The time dependant density functional theory (TD-DFT) was used to calculate the excitation energies using structural optimization at the (PCM) levels. This level of calculation was used to compare all selected dye with different solvent phase. The HOMO-LUMO energy gap of chosen dyes Coumarin-6, Coumarin 153 and Coumarin 343 are compared. The light harvesting efficiency (LHE) and free energy change of electron injection were anchoring group of LUMO. This theoretical designing will pave the way for experimental to synthesize the efficient sensitizer for solar cells.

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